Advances in Spermatological Characters in the Digenea

Bakhoum, Abdoulaye J.S.; Miquel, Jordi; Ndiaye, Papa Ibnou; Justine, Jean‐Lou; Falchi, Alessandra; Bâ, Cheikh Tidiane; Marchand, Bernard; Quilichini, Yann

doi:10.1016/bs.apar.2017.04.001

Cited by 41 publications

(61 citation statements)

References 104 publications

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“…Mature spermatozoa of the Bucephalidae present numerous similarities with the type V described by Bakhoum et al [1]. This typology enables these authors to classify digeneans in five types of spermatozoa according to the state of eight principal ultrastructural characters.…”

Section: Discussionmentioning

confidence: 61%

“…Today, ultrastructural studies of the mature spermatozoon of Platyhelminthes have provided useful characters for the understanding of phylogenetic relationships between Platyhelminthes [1, 9, 12]. In the Bucephalidae, ultrastructural data on the mature spermatozoon exist for four species belonging to three genera, namely the bucephalines Prosorhynchoides arcuatus [10], Prosorhynchoides gracilescens published as Bucephaloides gracilescens [5], Pseudorhipidocotyle elopichthys [26] and the prosorhynchine Prosorhynchus aculeatus [14].…”

Section: Introductionmentioning

confidence: 99%

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Ultrastructure of mature spermatozoa of three Bucephalidae (Prosorhynchus longisaccatus, Rhipidocotyle khaliliandBucephalus margaritae) and phylogenetic implications

et al. 2018

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We describe here the mature spermatozoa of three species of bucephalids, namely Bucephalus margaritae, Rhipidocotyle khalili and Prosorhynchus longisaccatus. This study provides the first ultrastructural data on the genera Bucephalus and Rhipidocotyle and enabled us to confirm the model of the mature spermatozoon in the Bucephalinae. The spermatozoon exhibits two axonemes with the 9 + “1” pattern of the Trepaxonemata, one of which is very short, lateral expansion, external ornamentation of the plasma membrane located in the anterior extremity of the spermatozoon and associated with cortical microtubules, spine-like bodies, a mitochondrion, and a nucleus. The maximum number of cortical microtubules is located in the anterior part of the spermatozoon. However, more studies are needed to elucidate if spine-like bodies are present in all the Bucephalinae or not. In the Prosorhynchinae, the mature spermatozoon exhibits a similar ultrastructural pattern. Some differences are observed, particularly the axoneme lengths and the arrangement of the spine-like bodies. The posterior extremity of the spermatozoon in the Bucephalinae exhibits only the nucleus, but prosorhynchines have microtubules.

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Section: Discussionmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Ultrastructure of mature spermatozoa of three Bucephalidae (Prosorhynchus longisaccatus, Rhipidocotyle khaliliandBucephalus margaritae) and phylogenetic implications

et al. 2018

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“…However, up to date, the simultaneous occurrence of both types of arrangement of CM has never been reported in the spermatozoa of caryophyllidean species. Here, it is worth to note that CM are distributed into two fields situated between the two axonemes in the gyrocotyllidean and amphilinidean cestodes (Xylander 1989, Bruňanská et al 2012 and in most digeneans (Bakhoum et al 2017). However, the latter taxa differs from that of any Eucestoda by the presence of a mitochondrion in the spermatozoon.…”

Section: Discussionmentioning

confidence: 88%

Ultrastructure and cytochemistry of the mature spermatozoon of Khawia armeniaca (Cholodkovsky, 1915) (Caryophyllidea: Lytocestidae), a parasite of Capoeta capoeta sevangi (De Filippi, 1865) (Teleostei, Cyprinidae)

et al. 2020

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SummaryThe mature spermatozoon of Khawia armeniaca, a monozoic caryophyllidean parasite of templar fish Capoeta capoeta sevangi (De Filippi, 1865) from the Lake Sevan, Armenia, has been studied using transmission electron microscopy and cytochemical technique of Thiéry (1967) for the first time. The mature spermatozoon of K. armeniaca consists of a single axoneme with the 9+‘1’ trepaxonematan structure, cortical microtubules and nucleus which are situated parallel to the longitudinal axis of the spermatozoon, and a moderately electrondense cytoplasm with glycogen particles. The cortical microtubules are arranged in one continuous semicircle beneath the plasma membrane in Region II and anterior part of Region III of the mature spermatozoon. The two opposite rows of cortical microtubules are observed in the remaining nuclear and at the beginning of the postnuclear part (Regions III, IV) of the male gamete The number of cortical microtubules is remarkably variable in the spermatozoa of various Khawia species. K. armeniaca exhibits the highest number of cortical microtubules in comparison with K. sinensis and K. rossittensis. Glycogen was detected in the cytoplasm of prenuclear (II), nuclear (III) and postnuclear (IV) regions with different ultrastructural organization of the mature spermatozoon of K. armeniaca. Variations of sperm ultrastructural characters within caryophyllideans and other cestodes are discussed.

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“…In several metazoan taxa, sperm has proven to be a useful aid for taxonomic and phylogenetic analysis (Baccetti, 1985;Bakhoum et al, 2017;Dallai et al, 2016;Levron et al, 2010;Liana & Witali nski, 2005;Pitnick et al, 2009). In nematode studies, the F I G U R E 1 5 Bayesian mature sperm character reconstruction on the phylogenetic tree of Rhabditida.…”

Section: Spermatogenesis and Ancestral State Reconstruction In The mentioning

confidence: 99%

Structure, development, and evolutive patterns of spermatozoa in rhabditid nematodes (Nematoda: Rhabditida)

Slos

Yushin

Claeys

et al. 2020

Journal of Morphology

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Spermatogenesis of five rhabditid nematodes was studied using transmission electron microscopy and is described herein. Structure and development of nematode sperm in all available representatives of the extensive order Rhabditida have been analysed and the main characteristics of each infraorder are discussed. The ancestral sperm of the order Rhabditida was reconstructed using maximum likelihood and Bayesian methods based on 44 ultrastructural sperm characters. The hypothetical ancestral spermatogenesis of the order Rhabditida agrees with the previously suggested "rhabditid" pattern and appears to be conserved throughout the order Rhabditida. Despite the enormous variation of rhabditid nematodes, few groups deviate from the ancestral pattern. This conserved pattern can be informative within the phylum Nematoda at order level, but poses limitations when used in taxonomic and phylogenetic analysis within Rhabditida.

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Advances in Spermatological Characters in the Digenea

Cited by 41 publications

References 104 publications

Ultrastructure of mature spermatozoa of three Bucephalidae (Prosorhynchus longisaccatus, Rhipidocotyle khaliliandBucephalus margaritae) and phylogenetic implications

Ultrastructure of mature spermatozoa of three Bucephalidae (Prosorhynchus longisaccatus, Rhipidocotyle khaliliandBucephalus margaritae) and phylogenetic implications

Ultrastructure and cytochemistry of the mature spermatozoon of Khawia armeniaca (Cholodkovsky, 1915) (Caryophyllidea: Lytocestidae), a parasite of Capoeta capoeta sevangi (De Filippi, 1865) (Teleostei, Cyprinidae)

Structure, development, and evolutive patterns of spermatozoa in rhabditid nematodes (Nematoda: Rhabditida)

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